| Main Entry: | |
| Part of Speech: | adjective |
| Definition: | crucial, weighty |
| Synonyms: | arduous, dangerous, deep, difficult, far-reaching, fateful, fell, formidable, grave, grievous, grim, hard, heavy, important, laborious, major, meaning business, meaningful, menacing, momentous, no joke, no laughing matter, of consequence, operose, out for blood, playing hard ball, pressing, severe, significant, smoking, sobering, strenuous, strictly business, threatening, tough, ugly, unamusing, unhumorous, urgent, worrying |
| Antonyms: | light, minor, trivial, unimportant, unserious |